Besides missing some of the benefits of Event Sourcing, are there any other drawbacks to adapting an existing architecture to CQRS without the Event Sourcing piece?
The best CQRS pattern based framework in my opinion is MediatR by Jimmy Bogard, If you don't need Event Sourcing in the beginning of your application development, MediatR is the right choice. Here is the repository- https://github.com/jbogard/MediatR